pressure Poisson equation

MissCFD · May 20, 2016, 23:37

Hello,

Does anyone know if the pressure Poisson equation for the incompressible Navier-Stokes equations is used only with segregated solver or coupled solver too ?

Thank you for your help !

ghorrocks · May 21, 2016, 06:07

CFX does not have a segregated solver. It only has a coupled solver. The equations are solved as a coupled set of momentum and pressure equations, the pressure equation is not solved as a separate poisson equation.

MissCFD · May 22, 2016, 13:56

Quote:

Originally Posted by ghorrocks

CFX does not have a segregated solver. It only has a coupled solver. The equations are solved as a coupled set of momentum and pressure equations, the pressure equation is not solved as a separate poisson equation.

Thank you for you response but my question is: which one of the following is used in the couped solver ?

The poisson equation + momentum equation or
continuity equation + momentum equation ?

ghorrocks · May 22, 2016, 21:40

The continuity equation is combined with the momentum equations into a single matrix for solution in the coupled solver.

So I guess that means "continuity equation + momentum equation" is the correct answer.

May 20, 2016, 23:37	pressure Poisson equation	#1
MissCFD Senior Member Join Date: Aug 2014 Posts: 160 Rep Power: 11	Hello, Does anyone know if the pressure Poisson equation for the incompressible Navier-Stokes equations is used only with segregated solver or coupled solver too ? Thank you for your help !

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May 21, 2016, 06:07		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	CFX does not have a segregated solver. It only has a coupled solver. The equations are solved as a coupled set of momentum and pressure equations, the pressure equation is not solved as a separate poisson equation.

May 22, 2016, 21:40		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	The continuity equation is combined with the momentum equations into a single matrix for solution in the coupled solver. So I guess that means "continuity equation + momentum equation" is the correct answer.